Yes, that would be required to further investigate. If you have a subscription you could open up a ticket for this, if you don’t have a subscription you could send the file to feedback at kopano dot io.

I don’t think it is a problem of just one nightly but here is the information: core-8.6.80.1018_0+152-Ubuntu_18.04-i386

Outlook is connected by ActiveSync. Not only in Outlook but also in Kopano Webapp the text ist destroyed. That’s why I think the problem is in kopano-migration-pst.

The priority is low, because even if you find and fix the bug, I’m net sure if I will be able to replace the (hundreds) of old damaged mails with fixed copies.
I will send the testfile to the mail address…

Outlook is connected by ActiveSync. Not only in Outlook but also in Kopano Webapp

I must say neither of those clients will show you a rtf message anyways (WebApp is AFAIK incapable of showing rft and adtivesync only transmits plain and html as well). But I’m looking forward to your test file.